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<blockquote> -Which attribute does validation plugin uses: name or id? </blockquote> <a href="http://docs.jquery.com/Plugins/Validation">As per documentation</a>, the plugin requires that all <code>input</code> fields contain a <code>name</code> <code>attribute</code>. When specifying the <code>rules</code> and <code>messages</code> inside <code>.validate()</code>, you would use the <code>name</code> <code>attribute</code>. <blockquote> -How to add rules and error messages? </blockquote> The <code>min_length</code> rule should not contain an underscore. It's <code>minlength</code>. Otherwise, your code looked correct. Simple demo based on your code... jQuery: <pre><code>$(document).ready(function () { $("#account_info").validate({ rules: { phone_number: { required: true }, recipient_name: { required: true, minlength: 6 // <-- removed underscore } }, messages: { phone_number: { required: "this field is required" }, recipient_name: { required: "Enter recipient name", minlength: "Name should be at least {0} characters long" // <-- removed underscore } }, submitHandler: function (form) { // for demo alert('valid form'); // for demo return false; // for demo } }); }); </code></pre> HTML: <pre><code><form id="account_info"> <input type="text" name="phone_number" /> <input type="text" name="recipient_name" /> <input type="submit" /> </form> </code></pre> Working jsFiddle Demo: <a href="http://jsfiddle.net/rfgRL/">http://jsfiddle.net/rfgRL/</a> <hr> Also, when using a rule like <code>minlength</code>, your custom message can contain a placeholder, <code>{0}</code>, that inserts your specific rule definition. <pre><code>minlength: 6 </code></pre> with a custom message... <pre><code>minlength: "Name should be at least {0} characters long" </code></pre> will automatically display... <blockquote> Name should be at least 6 characters long </blockquote> <hr> Since you only call <code>.validate()</code> once on DOM ready to only initialize the validation plugin with its options, there is no purpose in assigning it to a variable; it's not being re-used anywhere... at least it shouldn't be. <pre><code>var v = jQuery("#account_info").validate({...}); </code></pre> Would simply be this... <pre><code>jQuery("#account_info").validate({...}); </code></pre> Elsewhere in your code, if you needed to test the <code>form</code> for validity or re-trigger a validity test, <a href="http://docs.jquery.com/Plugins/Validation/valid">use the <code>.valid()</code> method</a>. It will both return a boolean and trigger display of any pending form errors. Example: <pre><code>if (jQuery("#account_info").valid()) { ... </code></pre>
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